[RFC 1/6] scripts/get_abi.py: make it backward-compatible with Python 3.6

[Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>]

Despite being introduced on Python 3.6, the original implementation
was too limited: it doesn't accept anything but the argument.

Even on python 3.10.12, support was still limited, as more complex
operations cause SyntaxError:

	Exception occurred:
	  File ".../linux/Documentation/sphinx/kernel_abi.py", line 48, in <module>
	    from get_abi import AbiParser
	  File ".../linux/scripts/get_abi.py", line 525
	    msg += f"{part}\n{"-" * len(part)}\n\n"
                       ^
	SyntaxError: f-string: expecting '}'

Replace f-strings by normal string concatenation when it doesn't
work on Python 3.6.

Reported-by: Akira Yokosawa <akiyks@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
 scripts/get_abi.py | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/scripts/get_abi.py b/scripts/get_abi.py
index 543bed397c8c..e6e94f721fff 100755
--- a/scripts/get_abi.py
+++ b/scripts/get_abi.py
@@ -522,7 +522,7 @@ class AbiParser:
 
                 if cur_part and cur_part != part:
                     part = cur_part
-                    msg += f"{part}\n{"-" * len(part)}\n\n"
+                    msg += part + "\n"+ "-" * len(part) +"\n\n"
 
                 msg += f".. _{key}:\n\n"
 
@@ -546,7 +546,7 @@ class AbiParser:
                     msg += f"Defined on file :ref:`{base} <{ref[1]}>`\n\n"
 
             if wtype == "File":
-                msg += f"{names[0]}\n{"-" * len(names[0])}\n\n"
+                msg += names[0] +"\n" + "-" * len(names[0]) +"\n\n"
 
             desc = v.get("description")
             if not desc and wtype != "File":
@@ -570,7 +570,8 @@ class AbiParser:
 
             users = v.get("users")
             if users and users.strip(" \t\n"):
-                msg += f"Users:\n\t{users.strip("\n").replace('\n', '\n\t')}\n\n"
+                users = users.strip("\n").replace('\n', '\n\t')
+                msg += f"Users:\n\t{users}\n\n"
 
             ln = v.get("line_no", 1)
 
@@ -596,7 +597,9 @@ class AbiParser:
                 elif len(lines) == 1:
                     f.append(f"{fname}:{lines[0]}")
                 else:
-                    f.append(f"{fname} lines {", ".join(str(x) for x in lines)}")
+                    m = fname + "lines "
+                    m += ", ".join(str(x) for x in lines)
+                    f.append(m)
 
             self.log.warning("%s is defined %d times: %s", what, len(f), "; ".join(f))
 
@@ -644,10 +647,11 @@ class AbiParser:
                     if users:
                         print(f"Users:\t\t\t{users}")
 
-                    print(f"Defined on file{'s'[:len(files) ^ 1]}:\t{", ".join(files)}")
+                    print("Defined on file(s):\t" + ", ".join(files))
 
                     if desc:
-                        print(f"\n{desc.strip("\n")}\n")
+                        desc = desc.strip("\n")
+                        print(f"\n{desc}\n")
 
         if not found_keys:
             print(f"Regular expression /{expr}/ not found.")
-- 
2.48.1